<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        input:focus {
            background-color: rgb(235, 248, 253);
            color: blue;
        }
    </style>
</head>
<body>
    <input type="text" />
    <input type="text" />
    <input type="text" />
</body>
</html>